Twist drill gauge



June 5, 1945. A. RL J. PONCELET I 2,377,715

TWIST DRILL GAUGE Filed Aug. 28, 1943 lNvl-:NToR ARcmE H J. PoNcELET E". BY i ATTORNEY pints relative tothe axis of the drilL `My' 'improved gauge further comprises means, l `foredeteimiriing the proper pitch of the `cutting Patented June 5, 1945 UNITED STATES PATENT 0 F-Filctn i, j

e YArtist It.

J." restent, West -Lojs Angeles; iaiff.`

. intention relates te twist u rill `gauges andl more particularly to adjustable twist drill gauges.

`In@sharpening a twist drill, it fis necessary that tl-'ie two `cutting edges of the `drill be of the same lengthan'd extend at the same angle to the axis fof fthe' drill and terminate at their inner ends lata point that is the same distance from the "alisbf the drill, lsaid innerends of said cutting fedges being connected by means of a transverse erige"-portio'ii"exter'lding across the longitudinal fjiisff the drill, this "chisel point, or transverse edge, increasing in width as the diameter f the '-rn sri-ler that the drill will eut properly,- thetwb cutti-ngedge's `must be exactly alik'einlpitch and -l'ngth and llocation relativeto the axis of the its absolutely necessary, `asallganglia-fg 4must be done with reference `tothe axis iofe'the "drill,

More particularlymyinvention 'compisesl'gaug-e lng 4means for twist drills, `including er gauge dr-ill. It-is'f'a purpose of my invention to provide e a drill gauge whereby thiscan be accomplished l'rea'dily and "accurately Without too much loss of time. My improved 4gauge comprises a `gradu- 'ated v'ange cir-scale, which is utilized for 'the purl'se of `determining the length of l each of the two` batting edges of the drin `and forloeating the 1'oppositeends of each cutting edge vat the same "member-and a guidelmember, wlii'cllfarepivotally l connected togetherlsofthat the same canbeadejusted `angula-rly relative to 'each `other' to'la'djust the position of the `axis of the 'drill transversely of the gauging member, the Igaugingmember` `being `moved or adjusted rela-twente the :'guide member to :accomplish this. AAflzurthern'loreInyfinf l vrition comprises meansfor locking the guiding "and gauging members 4vin `their relative adjusted 'position to maintain the ysame relationship Vlee-'- tween said fguide and -gauge memlo'ers throughout size lfor the "gauging of @a drill offthe particular which the device isadjusted'.

AIt is afgurther fpurpo'seof my iinventionito pro- 'vide 4a fdevice `of the above mentioned character,

'which is se `c'onstructed `and arranged that the i length and the-pitchof each of the-cuttingedges of the drill can be readily gauged, an opening being provided `between a ange onlthe guide `member with whichfthe l drill-engages `and the pitch hgauge flange and graduatedfgauge flange,

' through Twhich' both thelength` of the -cut-tingedge edge, or angular `relation to 'the axis of the drill,

so that both cutting edges have the -same angular relaticn to the-axisof thedrill.- l Ilroider that both `of these purposes lcan be carried out accurately and the gauging ofthe `iii-"lll accomplished readilypto enable the more rapid sharpening -of the same in a proper and correctmanner, I provide `a `drill guide in com-` blnationwith the fabov'e referred to gauge, which is radjust'fab'le"transversely to thelgauge, andwhich cbmprisesabutment means with which lthe drill is r*heldin engagement, to hold the same inthe `sane relative position `with respect to the" gauge edgeof the drill.

Vforgaugirg` each of the two cutting edges. ,To

gauge the cutting edge it is desirable and sub-` 'stantially necessary, that the cutting edgel be `:placed `flush `with or closely adjacenttthe edge df the `:harige having the scale or graduations l thereon, -so that the length ofthe cutting edge and the location of the opposite endsof the cutting fedge can be accurately determined. After `one cutting edge has been brought t`o such posi-` tion l.`e"lativetothe` scale, the drill is 'rotated so to bring the'oth'er cuttingedge into a `corre- 4spending position" to the scale, and `my improved tool provideseuidingmeans whereby `the axis of the drill is maintained in thefsame position ddii-ing both f these gauging `operations.4 This and thefpitch thereof can 4be readilyf-observed',y e y and preferably, alight openings are, provided ad*- shining of strong lightI `throught-ncsa openings to make `it possible to better lfebserlf/elthe cutting It -is Aanother apurpose of my invention to .prof vide `a guide member that lis so construct-ed `and arranged that small drills can be readily held in l l iirm engagement therewith, a linger ripening` being provided in the-flange of such guide ymem,-

ber `for this purpose,-and which is-provided with a clamping member tha-tpengages` a` doubled `por-,-`

tion of saidguide-member -tdcIampthe body/.poreV l l tion 'of the gauge -inwadjustediposition relative to said guidemember. 1 ,l A ,I Other objects and advantages of myinvention will appear asthe description ofthe drawing proceeds. I 'desi-retohave it understood, yhow-` ever, that donot intend toglimitfmyself to the particular details 4shown or described, except "as denedi-n the claims.` l l i l i l In the drawing: l, l y Fig. 1 lis a view in perspective :showing Amy improved gauge ready -for adjustment vforlg'augrlg gauge member detached.

- Referring in detail to the drawing, my improved ,gaugingtool comprises a guidelmem'ber having abody portion comprising a pair of spaced members and I5, which are connected together by means of a bight portion 'I, which, preferably,.

is provided with a series of openings 8` therein to prevent accumulation of foreign matter between said members 5 and 6, said members `5 and 6 being, of course, formed by bending the metal of the guide member on itself.` vDue tothe provision of the openings 8 and the natural springiness of the metal of which the device is made, the two membersi and 6 will yield"y slightly relative to each other. The upper. member G .of` the body portion ofthe gauge is provided with a `iiange 9 extending'perpendicularly thereto, said flange extending along ,the-greater portion of the' edge of said portion 6 `opposite the bight portion 1, but terminating short of the forward edge Il] of the bodyfportion of the guide member; The forward edge II of the flange 9 is inclined rearwardly for apurpose Whichiwill'become evident below.` The lrear edge of said ange is -cut away at an angle, as-indicated at i I2, so' that small, short drill bits can be heldby the right hand Vin theoperation of the tool to 'gauge a drill bit.v The rear edge of thevbody portion made up of the parallel portions 5 and' 6 is similarly cut away at anangle,

' vas indicated at I3, forthe same purpose.

Pivotallyl mounted Von'the guide member is a gauge nfiember,` .which hasa bodyY 'portion i4 mounted 'betweenl the parallel walls 5 and 6 of the body portion of the guide member and piv- ,otally' connected therewith by means of a pivot member I5. Said body portion is provided with la depending flange I6, which serves as a nger grip for holding.r the gaugemember in the adbeing "gripped between the thumb and index finger of the left `hand in the use of the device rand being, prefrably, knurled, as indicated in Figs. 1 and2, or otherwisev roughened to prevent any slipping vof the thumb from the same. The gauge'member is provided with a forwardly inclined pitch gauging flange I'I extending at the proper angle to the body portion I4 of the gauge to obtain the desired pitch or angularity ofeach of the cutting edges of the drill. This angle is, preferably, an langle of 59 to the axis of the drill, as this is a standard that has been adopted for the drills for which the gauge is intended.` Extending substantially perpendicue larly to the flange I'I is a flange I8, which is provided with a scale I9 along the edge thereof that lies adjacent the junction of the iianges I'I and I8, the'graduations of the scale being, preferably, much ne'r than Shown in the drawing, as it would be impossible vto show the graduations as close together as these would actually be in practice on the scale ina patent drawing. vThe graduations. preferably, are 1m ofan inch apart at the lower portion of the scale, and 15;, of an inch apartover the'balance of the scale. The rst graduation on the scale I 9. preferably, is in alignment with the top face-ofthe wall 6 ofthe guide member." The graduations are, preferably, arranged at an oblique angle to the junction of the ju'stmentand vuse of the device, vsaid flange I6 iianges Il and I8, the angle of the graduations being, preferably, 60 to a perpendicular to said junction, which makes the reading of the location of the ends of the cutting edge much easier than if these are not arranged at such an angle.

Upon reference to Fig. 2, it will be obvious that quite a large opening yis provided between the ange Il and the inclined edge II of the flange 9 to enable the cutting edges of the drill to be readily observed when using thev gauge. Furthermore it will be noted that there are openings 20 provided in the gauge adjacent the junction of the flange Il with the body portion I4 to enable a strong light to be provided back of or underneaththe gauge shining through said openingsv to make the blade edge more readily visible as the same is being gauged.

The flange 9 is provided with a finger opening 2i therein for a purpose to be described below,

and has welded thereto the flattened portion of 'the ,locking means having the threaded stem portion 23. The locking means further comprises a knurled nut 24 screw-threadedly mounted on the stem portion 23, and an apertured ear 25 projecting from the edge portion ofthebottom wall Y5 of the guide body member. The threaded stem 23 extends through the aperture in the ear 25, and the body portion I4 is provided with a notch or recess 26 to accommodate the sternA 23. By `screwing the nut 24 upwardly on the'stem 23 into clampingengagement withthe ear '25 the two walls 5 and 6 will be clamped together so as to firmly hold the member 4I4;clamped therebetween against any pivotal movement about the pivot I5. 'Upon screwing the nut` 24 downwardly on the 'stem the' member I4 .will befreleased to permit adjustment of the gauge member relative to the guide member. Vi c In'the use of the gauge, the drill that isto be gauged is put in position on the gauging member with the point of the drill `tow-ard the pitch `gauging flange Il on the gauge `member and with the drill in engagement firmly with the iiange-*S and body member of the guide member along the entire length Vof the flange 9 and theupper member ii thereof, The gauging tool is held by en# lgaging the index finger andlthumb `with the The locking member is then operated to clamp the parts .inadjusted position. After such ad@` justment has been obtained the device is set ready to gauge a drill of thatl particular size.v

To v gauge the drill, thefdrill is put in position against the flange S and the top wall 6 of the bodyY portion of the gauge and with its forward or cutting end in engagement with vthe ange II, and the middle finger of the left hand is placed over the drill to rmly hold it against said flange Q and wall ii while the same is rotated by means of the right hand,.to successively bring the two cutting edges into alignment with the scale on the ange I8. Both the location of the inner and the outer end, as well as the length of the cutting edge is observed, and sharpening ofthe gauge and such gauging is continued until the Ainner end of both cutting edges lie onithe same graduation of the scale. 'If `the scale .com--` graduation is in alignment with the top face of the wall E, then the outer end of each cutting blade or edge should be at the zero point or loweris, ofcourse, also made with both cutting edges of the blade.

WhatI claim is: y i 1. A device for gauging twist drill bits, comprising a drill guide, having a drill receiving face and means for limiting movement of a drill transversely of said face, a gauge having a graduated portion thereon, means connecting said guide and gauge for relative adjustment of said gauge and guide transversely of said gauge about an axis perpendicular to said` drill receiving face to align thelcutting edges of the drill with said graduated portion, and means for locking said gauge and guide in adjusted position.

l 2.`A device for gauging drilllbits, comprising a drill guide having a `body. portion provided with a flange along one margin thereof, a gauge having a body portion pivotally connected to the body portion of saidguide, a pitch gauging flange extending at an oblique angle thereto, and a graduated cutting edge gauging flange on said pitch gauging flange, and means for lockingsaid gauge against pivotal movement relative to said guide. m

A device for gauging drill bits, comprising `a drill guide having a bodyportion fprovided With a flange along one margin thereof, a gauge having a body `portion pivotally `connected to the body portion of said guide, a pitch gauging `flange extending at an oblique angle thereto,

said body portion of said gauge having light openings therein adjacent the junction of said pitch gauging flange therewith, and a graduated cutting `edge gauging flange on said pitchgauging flange, and means for llocking said gauge against pivotal movementrelative to said guide. il. A device forgauging drill bits, comprising a drill guide having a body `portion provided with an upstanding flange `along one margin thereof,` i a gauge having a body portion pivotallyconnectm ed to the body portion of said guide having` a `depending finger griplflange along the margin mences at a point such that the bottcxmmost` said gauge against pivotal movement relative to vided with a flange along one margin thereof,

to the body portion of said guide, a pitch gauging flange extending at an oblique angle thereto, and a graduated cutting edge gauging flange on said pitch gauging flange,` and means for locking said guide.` l

3 6. A device `for gauging drill bits, comprising a` drill guide having a body portion provided with a flange `along one `margin thereof, said flange having a finger opening therein at its junction with the body portion and spaced'from the longitudinaledge of said flange remote from said junction, a gauge having a body portion pivotally connected to the body portion of said guide, a pitch gauging flange extending at an oblique angle thereto, and a graduated cutting edge gauging flange on said pitch gauging flange,

and means for locking saidgauge .against vpivotal movement relative to said guide. l

7. A devicefor gauging drill bits, comprising a drill guide having a doubled body portion provided with a flange along one margin thereof, a gauge having a body portion pivotally connected to the body portion of said guide and lying between the doubled portions of` said guide, a pitch gauging flange `extending at `an oblique angle thereto, and a graduated cutting edge gauging flange on said pitch gauging flange, and a` locking member mounted on said flange of said guide and having means `engaging the body portion thereof to clamp the body portion of said gauge `between said doubled portions of said guide.

8. A device for gauging drill bits, comprising a drill guide having a body portion provided with a flange along one margin thereof, a gauge hav.-

ing a body portion pivotally connected to `the body portion of said guide, a pitch gauging flange extendingat an oblique angle thereto, and a` graduated cutting edge gauging flange on said pitch gauging flange, andmeans for locking said` gauge against pivotal movement relative to said guide, the flange on saidguide having its edge and inclined in divergent relationthereto.

9. A device for gauging drill bits, comprising a drill guide having a `body portion provided with a flange `along `one margin thereof,"a gauge having a body portion pivotally connected to the body portion of said guide having a depending finger grip flange thereon, a pitch gauging flange ing said flange thereon, a pitch gauging flange extending at an obliqueangle thereto, and a graduated cutting edge gauging flange on said pitch gauging flange; and means for locking said gauge against pivotal movement relative to said guide. l ,b

5. A device for gauging drill bits; comprising a drill guide having a doubled body portion prg-` extending at an oblique angle thereto,` and av graduated cutting edge gauging flange on said pitch gauging flange,` and means for locking said gauge against pivotal movement relative to said guide, the graduations on said cutting edge gauging flange extending at an `oblique angle to the junction of saidpitch gauging and cutting edge gauging flanges.

ARCHIE R. J. PONCELET. 

